physics- atomic structure

1. why must the alpha particles have been repelled by the same charge that the alpha particles carried?

  • because some alpha particles reflected back
  • because no alpha particles reflected back
  • because all alpha particles reflected back
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2. why was the neutron the last subatomic particle to be discovered?

  • it has a negative charge
  • it has no charge
  • it is too small

3. what is radioactive contamination?

  • unwanted presence of materials containing radioactive atoms on other materials
  • wanted presence of materials containing radioactive atoms on other materials
  • unwanted presence of materials not containing radioactive atoms

4. how does the energy level of an electron change?

  • absorbing electromagnetic radiation changes them to a higher energy level
  • becoming an ion

5. what is irradiation?

  • the process of exposing an object to nuclear radiation but does not cause the object to become radioactive
  • process of exposing an object to nuclear radiation and it causes the object to become radioactive

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